<nav class="navbar navbar-dark bg-dark">
  <div class="container-fluid">
    <a class="navbar-brand" href="/admin">微信推送服务管理后台</a>
    <div class="d-flex">
      <a href="/admin/logout" class="btn btn-outline-light">退出登录</a>
    </div>
  </div>
</nav>